package com.gprinter.http;

import android.util.Log;

import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat;

/**
 * Created by acer on 2019/11/24.
 */

public class Files {
    /**
     *复制到类中就可以直*接调用
     */


        public static final int SIZETYPE_B = 1;// 获取文件大小单位为B的double值
        public static final int SIZETYPE_KB = 2;// 获取文件大小单位为KB的double值
        public static final int SIZETYPE_MB = 3;// 获取文件大小单位为MB的double值
        public static final int SIZETYPE_GB = 4;// 获取文件大小单位为GB的double值
        /**
         * 获取文件指定文件的指定单位的大小
         *
         * @param filePath
         *            文件路径
         * @param sizeType
         *            获取大小的类型1为B、2为KB、3为MB、4为GB
         * @return double值的大小
         */
        public static double getFileOrFilesSize(String filePath, int sizeType) {
            File file = new File(filePath);
            long blockSize = 0;
            try {
                if (file.isDirectory()) {
                    blockSize = getFileSizes(file);
                } else {
                    blockSize = getFileSize(file);
                }
            } catch (Exception e) {
                e.printStackTrace();
                Log.e("获取文件大小", "获取失败!");
            }
            return FormetFileSize(blockSize, sizeType);
        }
        /**
         * 调用此方法自动计算指定文件或指定文件夹的大小
         *
         * @param filePath
         *            文件路径
         * @return 计算好的带B、KB、MB、GB的字符串
         */
        public static String getAutoFileOrFilesSize(String filePath) {
            File file = new File(filePath);
            long blockSize = 0;
            try {
                if (file.isDirectory()) {
                    blockSize = getFileSizes(file);
                } else {
                    blockSize = getFileSize(file);
                }
            } catch (Exception e) {
                e.printStackTrace();
                Log.e("获取文件大小", "获取失败!");
            }
            return FormetFileSize(blockSize);
        }
        /**
         * 获取指定文件大小
         *
         * @param f
         * @return
         * @throws Exception
         */
        private static long getFileSize(File file) throws Exception {
            long size = 0;
            if (file.exists()) {
                FileInputStream fis = null;
                fis = new FileInputStream(file);
                size = fis.available();
            } else {
                file.createNewFile();
                Log.e("获取文件大小", "文件不存在!");
            }
            return size;
        }
        /**
         * 获取指定文件夹
         *
         * @param f
         * @return
         * @throws Exception
         */
        private static long getFileSizes(File f) throws Exception {
            long size = 0;
            File flist[] = f.listFiles();
            for (int i = 0; i < flist.length; i++) {
                if (flist[i].isDirectory()) {
                    size = size + getFileSizes(flist[i]);
                } else {
                    size = size + getFileSize(flist[i]);
                }
            }
            return size;
        }
        /**
         * 转换文件大小
         *
         * @param fileS
         * @return
         */
        private static String FormetFileSize(long fileS) {
            DecimalFormat df = new DecimalFormat("#.00");
            String fileSizeString = "";
            String wrongSize = "0B";
            if (fileS == 0) {
                return wrongSize;
            }
            if (fileS < 1024) {
                fileSizeString = df.format((double) fileS) + "B";
            } else if (fileS < 1048576) {
                fileSizeString = df.format((double) fileS / 1024) + "KB";
            } else if (fileS < 1073741824) {
                fileSizeString = df.format((double) fileS / 1048576) + "MB";
            } else {
                fileSizeString = df.format((double) fileS / 1073741824) + "GB";
            }
            return fileSizeString;
        }
        /**
         * 转换文件大小,指定转换的类型
         *
         * @param fileS
         * @param sizeType
         * @return
         */
        private static double FormetFileSize(long fileS, int sizeType) {
            DecimalFormat df = new DecimalFormat("#.00");
            double fileSizeLong = 0;
            switch (sizeType) {
                case SIZETYPE_B:
                    fileSizeLong = Double.valueOf(df.format((double) fileS));
                    break;
                case SIZETYPE_KB:
                    fileSizeLong = Double.valueOf(df.format((double) fileS / 1024));
                    break;
                case SIZETYPE_MB:
                    fileSizeLong = Double.valueOf(df.format((double) fileS / 1048576));
                    break;
                case SIZETYPE_GB:
                    fileSizeLong = Double.valueOf(df
                            .format((double) fileS / 1073741824));
                    break;
                default:
                    break;
            }
            return fileSizeLong;
        }
    }


